[APS221]

I agree with nakedhippie about Flickr still being the most popular place for these event photos. Not only is Flickr more anonymous, it's also geared towards photography. As flanker7 also mentioned, I think one of the reasons the nude turnout seemed low is because the race organizers cracked down on allowing unregistered runners without a bib number and a shoe chip, known as "bandits," on the course. This probably cut down on unregistered nude runners, and kept unregistered photographers from walking the course among the runners.

There good HD videos of the race, taken from a fixed location, by a couple of YouTube users.
-65seasons
-kevinsyoza

In addition, you can find some good photos of nude runners from the official race photographer, SportPhoto (sportphoto.com/). Look for the following bib numbers:
Note: Photos from Sportphoto are watermarked.
2786 & 2787
9624 & 9625
15751
26860 & 26861
42271 & 42272

If you go to the official website (zazzlebaytobreakers.com/), click on "live results," and enter the bib number, you can see a video of the runner crossing the finish line.

Also 37767 & 37768
I recognize her as Li'l Phi (Li'l φhi) from Voyeurweb. She mentioned in a photo contribution that she would be at the Bay to Breakers. See more of her here:
damiensdomain.com/EIP/lilphi.html